<template>
  <div class="pagination">
    <el-pagination
      :background="background"
      :current-page.sync="currentPage"
      :page-size.sync="pageSize"
      :layout="layout"
      :page-sizes="pageSizes"
      :pager-count="pagerCount"
      :total="total"
      v-bind="$attrs"
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
    />
  </div>
</template>

<script>
export default {
  name: "Pagination",
  props: {
    // 为分页按钮添加背景颜色
    background: {
      type: Boolean,
      default: true,
    },

    // 组件的布局
    layout: {
      type: String,
      default: "total, sizes, prev, pager, next, jumper",
    },

    // 每页显示个数选择器:默认从5开始
    pageSizes: {
      type: Array,
      default() {
        return [5, 10, 15, 30];
      },
    },

    // 移动端页码按钮的数量端默认值5
    pagerCount: {
      type: Number,
      default: document.body.clientWidth < 992 ? 5 : 7,
    },

    // 总条目数
    total: {
      required: true,
      type: Number,
    },

    // 当前页码
    page: {
      type: Number,
      default: 1,
    },

    // 每页显示条目个数
    limit: {
      type: Number,
      default: 5,
    },
  },
  data() {
    return {};
  },
  computed: {
    currentPage: {
      get() {
        return this.page;
      },
      set(val) {
        this.$emit("update:page", val);
      },
    },

    pageSize: {
      get() {
        return this.limit;
      },
      set(val) {
        this.$emit("update:limit", val);
      },
    },
  },

  methods: {
    // pageSize改变触发
    handleSizeChange(val) {
      if (this.currentPage * val > this.total) {
        this.currentPage = 1;
      }
      this.$emit("pagination", {
        page: this.currentPage,
        limit: val,
      });
    },

    // currentPage改变触发
    handleCurrentChange(val) {
      this.$emit("pagination", {
        page: val,
        limit: this.pageSize,
      });
    },
  },
};
</script>

<style scoped>
.pagination {
  background: #fff;
  padding: 32px 16px;
  text-align: center;
}
</style>
